content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.math;
  
  import java.util.Comparator;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.internal.observers.DeferredScalarObserver;
  
  final class ObservableMinMax<T> extends ObservableWithSource<T, T> {
  
      final Comparator<? super T> comparator;
  
      final int flag;
  
      ObservableMinMax(ObservableSource<T> source, Comparator<? super T> comparator, int flag) {
          super(source);
          this.comparator = comparator;
          this.flag = flag;
      }
  
      @Override
      protected void subscribeActual(Observer<? super T> observer) {
          source.subscribe(new MinMaxSubscriber<T>(observer, comparator, flag));
      }
  
      static final class MinMaxSubscriber<T> extends DeferredScalarObserver<T, T> {
  
          private static final long serialVersionUID = -4484454790848904397L;
  
          final Comparator<? super T> comparator;
  
          final int flag;
  
          MinMaxSubscriber(Observer<? super T> downstream, Comparator<? super T> comparator, int flag) {
              super(downstream);
              this.comparator = comparator;
              this.flag = flag;
          }
  
          @Override
          public void onNext(T value) {
              try {
                  T v = this.value;
                  if (v != null) {
                      if (comparator.compare(v, value) * flag > 0) {
                          this.value = value;
                      }
                  } else {
                      this.value = value;
                  }
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  upstream.dispose();
                  downstream.onError(ex);
              }
          }
  
      }
  }
  